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jb55 | 29 days ago (raw) | root | parent | reply | flag +2 
 I tried to make zaps a bolt12 thing at the start but I couldn’t figure this part out
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matt | 29 days ago (raw) | root | parent | reply | flag +1 
 Better late than never. See the Proof of Payment section at https://github.com/bitcoin/bips/pull/1555/files
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jb55 | 29 days ago (raw) | root | parent | reply | flag 
 I don’t see how web clients could fetch offer invoices though, would have to use lnsocket/lnmessage and websocket proxies. With lnurl it’s much easier for web apps to fetch invoices.
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matt | 29 days ago (raw) | root | parent | reply | flag 
 The web client shouldn’t be fetching the invoice, it just passes the whole offer on to the wallet and asks it to pay. When the wallet completes it does a callback to the initiating app.
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matt | 29 days ago (raw) | root | parent | reply | flag 
 Admittedly I wasn’t really thinking about web apps in the above design though. Nothing specific shouldn’t work except that the spec explicitly says wallets can’t open a callback URI that has a scheme of http(s). I was worried about it being a way for a payee to discover the payers IP, but I think maybe it doesn’t matter.